Import/Export Ideas for towns and cities in the middle ages
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So, I am working on building a "Campaign World" and have come to the point of building towns. While I have populations and such as well as the ruler type for towns setup in my head, I need ideas, and good reasoning behind them, for Imports and almost more importantly, Exports. I have one town, by the name of Ion, which exports Iron and Coal. The town depends heavily on the sale of Iron, but gets by with the amount of Coal that they mine out as well. I have towns that live in forests, plains, and sea shores or islands. Currently, I am working on the mountain type towns to see what would be exported and why as well as what would be imported. What I mean by this, is large quantities bought and sold by the town to other towns. Any takers on this?